As of 11 a.m. Friday, officials said they have already responded to 20,747 calls and expect the total to top 21,331 by the end of the year.

The new total is expected to set a record for the department.

Fire officials said the increase means extra work for not just firefighters and medics, but also Training, Maintenance, Special Operations, Technical Services, Emergency Medical Services and Fire Prevention sections.

Hillary Clinton's office said "nothing nefarious was at play" when the former secretary of state used her personal email address, rather than one provided by the State Department, during her four years as America's top diplomat.